16691385978144 has 96 divisors (see below), whose sum is σ = 48684121778880. Its totient is φ = 5563691020800.

The previous prime is 16691385978103. The next prime is 16691385978193. The reversal of 16691385978144 is 44187958319661.

16691385978144 is a `hidden beast` number, since 1 + 6 + 6 + 9 + 13 + 8 + 597 + 8 + 14 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56020924 + ... + 56318084.

It is an arithmetic number, because the mean of its divisors is an integer number (507126268530).

Almost surely, 2^{16691385978144} is an apocalyptic number.

It is an amenable number.

16691385978144 is an abundant number, since it is smaller than the sum of its proper divisors (31992735800736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16691385978144 is a wasteful number, since it uses less digits than its factorization.

16691385978144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362191 (or 362177 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 72.

The spelling of 16691385978144 in words is "sixteen trillion, six hundred ninety-one billion, three hundred eighty-five million, nine hundred seventy-eight thousand, one hundred forty-four".